TY  - JOUR
AU  - Aristizabal Sierra, D.
AU  - Degee, A.
AU  - Dorame, L.
AU  - Hirsch, M.
PY  - 2015
DA  - 2015//
TI  - Systematic classification of two-loop realizations of the Weinberg operator
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 040
EP  - 41pp
VL  - 03
IS  - 3
PB  - Springer
KW  - Beyond Standard Model
KW  - Neutrino Physics
AB  - We systematically analyze the d = 5 Weinberg operator at 2-loop order. Using a diagrammatic approach, we identify two different interesting categories of neutrino mass models: (i) Genuine 2-loop models for which both, tree-level and 1-loop contributions, are guaranteed to be absent. And (ii) finite 2-loop diagrams, which correspond to the 1-loop generation of some particular vertex appearing in a given 1-loop neutrino mass model, thus being effectively 2-loop. From the large list of all possible 2-loop diagrams, the vast majority are infinite corrections to lower order neutrino mass models and only a moderately small number of diagrams fall into these two interesting classes. Moreover, all diagrams in class (i) are just variations of three basic diagrams, with examples discussed in the literature before. Similarly, we also show that class (ii) diagrams consists of only variations of these three plus two more basic diagrams. Finally, we show how our results can be consistently and readily used in order to construct two-loop neutrino mass models.
SN  - 1029-8479
UR  - http://arxiv.org/abs/1411.7038
UR  - https://doi.org/10.1007/JHEP03(2015)040
DO  - 10.1007/JHEP03(2015)040
LA  - English
N1  - WOS:000351365700002
ID  - AristizabalSierra_etal2015
ER  -